How can we think about the future without having a bad feeling?

i'm a student and i know that i have a future but it is so difficult to be good enough for what i want that it is impossivel to me look to my future without having a bad feeling...

Closing Statement from Débora Correia

I still thinking that it´s to difficult to be good enough, but now i see that the most important it is not what we gonna do in our future but what we will feel and change with it. Somethings we can control, others no, so we have to take it easy because one day we will show how good we are.
Thanks to everybody that so friendly answers to me and hopes that everything get lighter in the future.

P.S: I want to be a doctor , yes, and here in Portugal it's very very difficult and i'm just in the highschool...

Jan 29 2013:
One day at a time. The future arives one day at a time. So one wise use of today is the power you've got.
Fear is not a rare human experience; but you've got to focus on possibilities and opportunities; and move on despite the fears.

Feb 3 2013:
I'd say, try to be useful or perform a use. Often it is not what you do but how you do it.

Relax and follow intuitions and opportunities. We are not in charge as to what happens to us so we do not control the details of our future. So do not worry about the details.

We are only in this life for one single reason. We are here not for the sake of getting rich or famous. The one reason we are here is to develop and grow the best character we can. The rest is just details.

Jan 29 2013:
Do just as your past generations did. Hope for the best, ask yourself what you can do to make the future better and have the courage to do it.

The present of today was an unknown future yesterday but people who stopped asking questions, stopped following others, and took the lead in learning and doing something about it made the future great.

Jan 29 2013:
One idea might be always to be doing some things you are good at that also make you feel good while you are working at getting better at the things that are more challenging and sometimes frustrating.

Jan 29 2013:
The future is not something that we all march into in lock step. It is an exploration of an unmarked territory that we have no map for.
Whatever you think of the future...its not going to be that.
Whatever you are planning to do as a career...you probably won't end up taking.
What you need to do is sharpen you awareness of the world around you and jump when an opportunity briefly makes its self available to you.
Its the same approach that everyone has taken since we came down from the trees. The successful ones know when to jump.